The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 2000
Filed:
Nov. 19, 1998
Scott A Chockley, Market Drayton, GB;
Jeffrey D Graves, Chenoa, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A hydraulically actuated fuel injector includes an injector body containing an intensifier piston with a hydraulic surface exposed to fluid pressure in a hydraulic pressure cavity. This hydraulic surface includes an annular taper and moves within a bore due to the pressure in the hydraulic pressure cavity. Prior to the injection event, the intensifier piston is in a retracted position that partially blocks at least one actuation fluid supply passage. At the initiation of the injection event, the partial blocking of the actuation fluid passage results in a slower initial movement rate of the intensifier piston. The injection flow rate is a function of the speed of the intensifier piston. The initial rate shaping is accomplished by controlling the initial speed of the intensifier piston by at least partially blocking one or more of the actuation fluid supply passages.